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Method for suppressing reverse time migration low frequency noise

A technology of low-frequency noise and reverse time migration, applied in seismic signal processing, etc., can solve the problem that seismic noise has not made further breakthroughs, and achieve the effect of improving imaging effect, strong adaptability, and simple implementation

Inactive Publication Date: 2014-07-16
NORTHEAST GASOLINEEUM UNIV
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Problems solved by technology

[0004] In the prior art, although reverse time migration technology has been applied in the field of geophysical exploration technology, no further breakthrough has been made in the processing of seismic noise, especially in the noise suppression process for Walkaway VSP reverse time migration

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  • Method for suppressing reverse time migration low frequency noise
  • Method for suppressing reverse time migration low frequency noise
  • Method for suppressing reverse time migration low frequency noise

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Embodiment Construction

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention. Additionally, the scope of protection of the present invention should not be limited only to the following specific steps or specific parameters.

[0042] The method for suppressing reverse time migration low-frequency noise of the present invention is based on the following research:

[0043] (1) The source normalized cross-correlation imaging condition is to carry out the source normalization under the original cross-correlation imaging condition...

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Abstract

The invention discloses a method for suppressing reverse time migration low frequency noise. The method is used for suppressing residual noise energy after Laplace denoising of Walkaway VSP data reverse time migration result data obtained based on a sound wave equation and a focus normalization mutual correlation imaging condition, the noise suppressing method is an improved non-local mean filtering method, and calculation of similar factors is mainly based on an input deep region layer speed model for reverse time migration. The method is applied to imaging body processing after Laplace filtering, low frequency noise can be effectively suppressed, and images of underground geologic bodies are clearer and more accurate.

Description

technical field [0001] The invention belongs to the technical field of geophysical exploration, and relates to a method for suppressing low-frequency noise in reverse time migration, in particular to a denoising method in reverse time migration processing of Walkaway VSP seismic data, and is especially suitable for reverse time migration of Walkaway VSP The final imaging data volume obtained by the method is denoised to make the imaging result clearer. Background technique [0002] Reverse time migration technology is currently the seismic migration method with the highest imaging accuracy in the field of seismic exploration. Today, when exploration targets are becoming increasingly complex and diverse, the advantages of reverse time migration technology in imaging complex structures will help seismic exploration to explore deep hidden oil and gas reservoirs. The reverse time migration technology first appeared in 1983, when geophysicists such as Whitmore (1983), Baysal (19...

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Application Information

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IPC IPC(8): G01V1/36
Inventor 王维红石颖郭雪豹李婷婷柯璇井洪亮
Owner NORTHEAST GASOLINEEUM UNIV
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